<template>
  <view>
    <view class="search-box">
      <uni-search-bar @confirm="search" @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length!==0">
      <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    <!-- 搜索历史 -->
    <view class="history-box" v-else >
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区域 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
    
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',
        //搜索结果列表
        searchResults:[],
        //搜索历史的数组
        historyList:[]
        
        
      };
    },
    onLoad(){
      this.historyList=JSON.parse(uni.getStorageSync('kw')||'[]')
    },
    methods:{
      input(e){
        // console.log(e.value)
        clearTimeout(this.timer)
       this.timer= setTimeout(()=>{
          // console.log(e)
          this.kw=e
        this.getSearchList()
        },500)
      },
     async  getSearchList(){
        //判断搜索关键词是否为空
        if(this.kw.length===0){
          this.searchResults=[]
          return 
        }
      const {data:res} =await uni.$http.get('api/public/v1/goods/qsearch',{query:this.kw})
     if(res.meta.status!==200){
       return uni.showToast({
         title:'数据加载失败',
         duration:1500,
         icon:'none'
       })
     }
     this.searchResults=res.message
     this.saveSearchHistory()
      },
      gotoDetail(item){
        // console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
        })
        
      },
      saveSearchHistory(){
        //保存搜索历史记录
        // this.historyList.push(this.kw)
        // 解决关键词重复问题
        // 将Array数组转化成set对象
        const set=new Set(this.historyList)
        // 移除对应的元素
        set.delete(this.kw)
        // 添加对应的元素
        set.add(this.kw)
        // set对象转化为数组
        this.historyList=Array.from(set)
        
        // 对搜索历史数据进行持久化储存
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      //清空搜索记录
      clean(){
        this.historyList=[]
        uni.setStorageSync('kw','[]') 
      },
      gotoGoodsList(kw) {
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?query=' + kw
        })
        
      }
      
    },
    computed:{
      //将搜索历史反转
      // 主义,由于数组是引用类型,所以不要直接基于原数组调用reverse方法,以免修改原数组中的元素的顺序
      // 而是应该新建一个内存无关的数组,在进行reverse
      histories(){
       return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name{
      // 超出部分不换行
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
   
  }
}
.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;

  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
    
  }
}
</style>
